set SDLMIXER_VENDORED to ON and vendor the required libraries into libs/SDL3_mixer/external

disable SDLMIXER_VORBIS_VORBISFILE
add ogg v1.3.5-SDL
add opus v1.4.x-SDL
add opusfile v0.13-git-SDL

libs/SDL3_mixer/external/opus/celt/dump_modes/Makefile

@@ -0,0 +1,32 @@
+
+CFLAGS=-O2 -Wall -Wextra -DHAVE_CONFIG_H
+INCLUDES=-I. -I../ -I../.. -I../../include
+
+SOURCES = dump_modes.c \
+          ../modes.c \
+          ../cwrs.c \
+          ../rate.c \
+          ../entcode.c \
+          ../entenc.c \
+          ../entdec.c \
+          ../mathops.c \
+          ../mdct.c \
+          ../kiss_fft.c
+
+ifdef HAVE_ARM_NE10
+CC = gcc
+CFLAGS += -mfpu=neon
+INCLUDES += -I$(NE10_INCDIR) -DHAVE_ARM_NE10 -DOPUS_ARM_PRESUME_NEON_INTR
+LIBS = -L$(NE10_LIBDIR) -lNE10
+SOURCES += ../arm/celt_ne10_fft.c \
+           dump_modes_arm_ne10.c \
+           ../arm/armcpu.c
+endif
+
+all: dump_modes
+
+dump_modes:
+	$(PREFIX)$(CC) $(CFLAGS) $(INCLUDES) -DCUSTOM_MODES_ONLY -DCUSTOM_MODES $(SOURCES) -o $@ $(LIBS) -lm
+
+clean:
+	rm -f dump_modes